IntelliPack Series 811T Transmitter/Alarm User's Manual DC Voltage/Current Input
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Notes (Field Program Procedure)…continued:
3. If the transmitter/alarm is in field configuration mode and no
push buttons are pressed after 2 minutes, then the module
will return to the run mode, the green “Run” LED will light, and
no changes to any program parameters will be made.
4. Latching alarms require a push button reset to exit the alarm
state (this may also be accomplished under software control).
Use the up or down push-button on the front of the module to
reset a latched alarm relay.
4.0 THEORY OF OPERATION
Refer to Simplified Schematic 4501-629 and Functional Block
Diagram 4501-691 to gain a better understanding of the circuit.
Note that these transmitters will pre-filter a signal and convert the
signal to a scaled voltage--either through a voltage divider circuit
(voltage inputs), or a current sink resistor (current inputs). An
A/D converter stage then applies appropriate gain to the signal,
performs analog-to-digital conversion, and digitally filters the
signal. The digitized signal is then transmitted serially to a
microcontroller. The microcontroller completes the transfer
function according to the transmitter type and its embedded
function, and sends a corresponding output signal to an optically
isolated Digital-to-Analog Converter (DAC). The DAC then
updates its current or voltage output in response. The
microcontroller also compares the signal value to the limit value
according to the alarm type and completes all necessary alarm
functions per its embedded program (811T-1500 units only). The
embedded configuration and calibration parameters are stored in
non-volatile memory integrated within the microcontroller. Only
the functions required by an application are actually stored in
memory
—new functionality can be downloaded via the IntelliPack
Configuration Program and Serial Port Adapter. A wide input
switching regulator (isolated flyback mode) provides is5V
and +16V power to the circuit, plus an is15V output circuit
supply.
5.0 SERVICE AND REPAIR
CAUTION:
Risk of Electric Shock - More than one
disconnect switch may be required to de-energize the
equipment before servicing.
SERVICE AND REPAIR ASSISTANCE
This module contains solid-state components and requires no
maintenance, except for periodic cleaning and transmitter
configuration parameter (zero, full-scale, setpoint, deadband, etc)
verification. Since Surface Mounted Technology (SMT) boards
are generally difficult to repair, it is highly recommended that a
non-functioning module be returned to Acromag for repair. The
board can be damaged unless special SMT repair and service
tools are used. Further, Acromag has automated test equipment
that thoroughly checks and calibrates the performance of each
module. Please refer to Acromag’s Service Policy Bulletin or
contact Acromag for complete details on how to obtain service
parts and repair.
PRELIMINARY SERVICE PROCEDURE
Before beginning repair, be sure that all installation and
configuration procedures have been followed. The unit routinely
performs internal diagnostics following power-up or reset. During
this period, all LED’s will turn ON momentarily, and the green
“Run” LED flashes. If the diagnostics complete successfully, the
“Run” LED will stop flashing after approximately one second and
remain ON. This indicates that the unit is operating normally. If
the “Run” LED continues to flash, then this is indicative of a
problem. In this case, use the Acromag IntelliPack Configuration
Software to reconfigure the module or download its firmware and
this will usually cure the problem. If the diagnostics continue to
indicate a problem (a continuously flashing green LED), or if other
evidence points to a problem with the unit, an effective and
convenient fault diagnosis method is to exchange the
questionable module with a known good unit.
The IntelliPack Serial Port Adapter also contains a red LED
visible at the small opening in the enclosure to the right of the
RJ11 receptacle. If this LED is OFF or Flashing and power is
ON, then a communication interface problem exists. Note that
the adapter receives its power from the IntelliPack module. A
constant ON LED indicates a properly working and powered
serial interface adapter.
Acromag’s Application Engineers can provide further
technical assistance if required. When needed, complete repair
services are available from Acromag.
6.0 SPECIFICATIONS
811T-1500-C
, Single I/V Input, Process I/V Output, SPDT Relay
811T-0500-C
, Single I/V Input, Process I/V Output
General:
The IntelliPack Model 811T-0500 is a DC-powered
transmitter which conditions either a single process current or
voltage input, and provides an isolated current or voltage
output. Isolation is supplied between the sensor input, the
output, and power. The 811T-1500 also includes a SPDT,
Form C, electro-mechanical relay, which provides a local limit
alarm function with isolated relay contacts. This transmitter/
alarm is DIN-rail mounted.
The unit is configured and calibrated with our user-friendly
Window 95
or NT
IntelliPack Configuration Program.
Push-buttons on the module allow adjustment to the zero and
full-scale points for the transmitter, plus setpoint and
deadband adjustment for modules with the alarm option. All
calibration and configuration information is stored in non-
volatile reprogrammable memory in the module.
MODEL NUMBER DEFINITION
Transmitters are color code
d with a white label. The prefix “8”
denotes the IntelliPack Series 800, while the “T” suffix specifies
that this device is primarily a process transmitter.
811T:
Transmits and isolates a single DC voltage or current
input, or AC current input (using external sensor).
-X500:
The four digits of this model suffix represent the following
options, respectively: